Dressed in a beautiful, black sequin bodiced and cream-skirted gown by Chanel, the star eschewed the clichéd finishing flourishes favoured by the ever-present, limelight-hungry guests at the glamorous festival. No smoky, come-to-bed eye make-up for Emma; no eyewateringly-expensive diamond necklace requiring its own bodyguard, just an ever-so-slightly rebellious punctuation perched on her left ear.

The suitably blingy ear cuff comprised of three diamond-encrusted rings (see what she did there?) is titled 'Berbère' by its creator, Italian jewellery house Repossi. Inspired by the tattoos of Tuareg nomads, it features three hinged hoops mounted on to a silver stem, so one's bling doesn't start slipping. A version in 18-karat gold is currently stocked by Net-A-Porter com -
yours for a cool £9,515.

Ear cuffs have gained momentum on the red carpet of late, spurred on by the Punk-themed Met Ball earlier this month, where both Sienna Miller and Cara Delevingne sported side-swept hairstyles to show off their pieces of upper-ear candy.

The Sofia Coppola-directed film in which Watson plays Nicki, a fame-obsessed valley girl who in real-life partook in the robbing of several celebrities' homes (including Paris Hilton's, where they looted her extensive jewellery collection), is receiving rave reviews. Looks like Emma brought a little bit of bad-girl Nicki with her to Cannes.